Rank the way you are most likely to buy the earphone.
In the retail shop.
On the Internet.
From the manufacturer.
What price can you accept?
Less than 100
100~200
200~500
500~1000
More than 1000
What do you usually go abroad fot?
Work
Study
Visiting relative or friends
Sightseeing
Rank the method you will choose if you meet language barrier in foreign countries.
Asking a passer-by.
Bring a translator.
Following by the guide.
How often do you use earphone?
Everyday
Usually
Seldom
Never
Under what cirumstances you will buy more than one pair of earphone?
There is a discount.
The second pair of half price.
Buy two, get one free.